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Date May 2019 Marks available 1 Reference code 19M.1.hl.TZ1.16
Level HL Paper 1 Time zone TZ1
Command term Question number 16 Adapted from N/A

Question

Which is correct for the reaction H2O (g) → H2O (l) ?

 

A. Enthalpy increases and entropy increases.

B. Enthalpy decreases and entropy increases.

C. Enthalpy increases and entropy decreases.

D. Enthalpy decreases and entropy decreases.

Markscheme

D

Examiners report

Higher scoring candidates had more success understanding enthalpy and entropy decreases.

Syllabus sections

Additional higher level (AHL) » Topic 15: Energetics/thermochemistry » 15.2 Entropy and spontaneity
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